Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
  • C08L25/02—Homopolymers or copolymers of hydrocarbons
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
  • C09B67/00—Influencing the physical, e.g. the dyeing or printing properties of dyestuffs without chemical reactions, e.g. by treating with solvents grinding or grinding assistants, coating of pigments or dyes; Process features in the making of dyestuff preparations; Dyestuff preparations of a special physical nature, e.g. tablets, films
  • C09B67/0096—Purification; Precipitation; Filtration
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
  • C08K5/0041—Optical brightening agents, organic pigments
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/0091—Complexes with metal-heteroatom-bonds
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/16—Nitrogen-containing compounds
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/16—Nitrogen-containing compounds
  • C08K5/20—Carboxylic acid amides

Definitions

• the present invention relates to a heat stable thermoplastic resin composition. More particularly, it relates to a thermoplastic resin having improved heat stabi­lity which can be molded even at high temperatures to give a molded article having few or no silver streaks on the arti­cle.
• ⁇ -methylstyrene base copolymer with good heat resistance is produced by replacing a part or the whole of styrene in a styrene base resin such as a sty­rene-acrylonitrile copolymer with ⁇ -methylstyrene and that blend of the ⁇ -methylstyrene base copolymer with other resin such as an ABS graft polymer provides a resin composition which has improved heat resistance.
• the ⁇ -methylstyrene base copolymer and the blend of said copolymer with the ABS graft polymer are practically used.
• Such copolymer or blend may be colored by an inorganic or organic colorant.
• the copolymer or the blend having the higher ⁇ -methylstyrene content should be processed at a higher temperature. But, at the higher processing temperature, silver streaks often appear on the surface of the molded article and do not dis­appear in subsequent fabrication steps such as coating. When the processing technique is lowered to prevent the formation of silver streaks, processability is decreased and problems such as short molding are caused.
• a colorant is added to the ⁇ -­methylstyrene base copolymer and its resin composition before or during molding as in the case of other thermo­plastic resin.
• an organo­metallic colorant causes more frequently the silver streaks than other colorants.
• One object of the present invention is to provide a thermoplastic resin composition comprising an ⁇ -alkyl-­substituted aromatic copolymer which has good heat stabi­lity.
• Another object of the present invention is to provide a thermoplastic resin composition comprising an ⁇ -­alkyl-substituted aromatic copolymer which gives a molded article having few or no silver streak on its surface.
• Further object of the present invention is to provide an organometallic colorant which causes less silver streaks on a surface of a molded article of an ⁇ -alkyl-­substituted aromatic copolymer.
• thermoplastic resin composition which comprises a thermoplastic resin which contains at least 5 % by weight of an ⁇ -alkyl-substituted aromatic copolymer comprising ⁇ -alkyl-substituted aromatic vinyl compound and at least one other comonomer copolymerizable therewith, wherein the composition contains a metal-deactivating agent which has a molecular weight of not more than 2,000 and at least one group of the formula: or an organometallic colorant containing free metal in an amount of not more than 2,000 ppm.
• an organometallic colorant for a thermoplastic resin which contains at least 5 % by weight of an ⁇ -alkyl-substituted aromatic copolymer comprising ⁇ -­alkyl-substituted aromatic vinyl compound and at least one other comonomer copolymerizable therewith, which colorant contains free metal in an amount of not more than 2,000 ppm.
• the ⁇ -alkyl-substituted aromatic vinyl compound contained in the ⁇ -alkyl-substituted aromatic copo­lymer used in the present invention is represented by the formula: wherein R1 is C1-C3 alkyl and R2 is hydrogen, halogen or C1-­C3 alkyl.
• R1 is C1-C3 alkyl
• R2 is hydrogen, halogen or C1-­C3 alkyl.
• Specific example of the vinyl compound are ⁇ -­methylstyrene, ⁇ -methyl-p-chlorostyrene, ⁇ -methyl-p-methyl­styrene and the like. These vinyl compounds may be used individually or as a mixture of two or more of them. In view of heat resistance and a property balance of the copo­lymer, ⁇ -methylstyrene is preferred.
• aromatic vinyl compounds except the ⁇ -alkyl-substituted aromatic vinyl compound, vinyl cyanide, unsaturated carbo­xylic acids and their alkyl esters or anhydrides, maleimide and its N-alkyl or N-aryl substituted derivatives, rubbery polymers and the like.
• These comonomers may be used indivi­dually or as a mixture of two or more of them.
• aromatic vinyl compound except the ⁇ -alkyl-substituted one are styrene, p-methyl­styrene, nuclear halogen-substituted styrene and mixtures thereof. Among them, styrene is preferred.
• vinyl cyanide examples include acrylo­nitrile, methacrylonitrile, maleonitrile, fumaronitrile and mixtures thereof. Among them, acrylonitrile is preferred.
• unsaturated carboxylic acid and its alkyl ester or anhydride are acrylic acid, methacrylic acid, fumaric acid, itaconic acid, maleic acid, methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)­acrylate, butyl (meth)acrylate and maleic anhydride.
• methyl methacrylate and maleic anhydride are preferivelyred.
• maleimide and its N-alkyl or N-aryl substituted derivative are maleimide, methylmale­imide, ethylmaleimide, N-phenylmaleimide and O-chloro-N-­phenylmaleimide. Among them, N-phenylmaleimide is preferivelyred.
• the rubbery polymer are poly­butadiene, butadiene-styrene copolymer, butadiene-acrylo­nitrile copolymer, ethylene-propylene copolymer, ethylene­propyrene-non-conjugated diene copolymer, polybutyl acry­late, ethylene-vinyl acetate copolymer and chlorinated poly­ethylene.
• the ratio of the ⁇ -alkyl-substituted aromatic vinyl compound and other comonomer in the ⁇ -alkyl-substi­tuted aromatic copolymer is not limited.
• a preferred content of the ⁇ -alkyl-substituted aromatic vinyl compound is from 5 to 90 % by weight and that of other comonomer is from 95 to 10 % by weight.
• styrene acrylonitrile
• methyl methacrylate maleic anhydride
• methacrylic acid methacrylic acid
• N-­phenylmaleimide polybutadiene
• ⁇ -alkyl-substituted aro­matic copolymer examples include ⁇ -methylstyrene-acrylonitrile copolymer, ⁇ ­-methylstyrene-methyl methacrylate-(acrylonitrile or sty­rene) copolymer, ⁇ -methylstyrene-maleic anhydride-(acrylo­nitrile or styrene) copolymer, ⁇ -methylstyrene-N-phenylmale­imide-(acrylonitrile or styrene) copolymer, ⁇ -methylstyrene-­polybutadiene-(acrylonitrile or styrene) copolymer and the like.
• the copolymer preferably has an intrin­sic viscosity of 0.3 to 1.0 (at 30°C in dimethylformamide).
• the ⁇ -alkyl-substituted aromatic copolymer may be prepared by any of conventional polymerization methods sui­table for polymerization of the ⁇ -alkyl-substituted aromatic vinyl compound, for example, emulsion polymerization, sus­pension polymerization, solution polymerization, bulk poly­merization and combinations thereof.
• thermoplastic resin composition of the present inven­tion examples include a polymer comprising at least one monomer of the above described monomers such as the aromatic vinyl com­pounds except the ⁇ -alkyl-substituted aromatic vinyl com­pound, vinyl cyanide, the unsaturated carboxylic acids and their alkyl esters or anhydrides and maleimide and its N-­alkyl or N-aryl substituted derivatives; and conventional resins such as polycarbonate, polyphenyleneoxide, poly­sulfone, polyester, polyamide, polyacetal and the like. These other polymers may be used individually or as a mix­ture of two or more polymers.
• preferred other polymers are a copolymer of the aromatic vinyl compound with vinyl cyanide and/or the alkyl ester of unsaturated carboxylic acid, a graft polymer of the rubbery polymer with the aromatic vinyl compound, vinyl cyanide and/or the alkyl ester of unsaturated carboxylic acid, and a mixture of the former copolymer and the latter graft polymer.
• the amount of ⁇ -alkyl-substituted aromatic copolymer is preferably at least 5 % by weight, more prefe­rably from 5 to 95 % by weight based on the whole weight of the thermoplastic resin.
• the content of active free metal in the resin composition is reduced by the addition of the metal-deactivating agent which has the group (I).
• the metal-deactivating agent includes the com­pounds represented by the following formulae: wherein R1 and R2 are the same or different and hydrogen, C1-C20 alkyl, hydroxyl alkyl, aryl-substituted alkyl, hydro­xyaryl-substituted alkyl, aryl, hydroxyaryl, alkyl-substi­tuted aryl or alkyl-substituted hydroxyaryl; R3 and R4 are the same or different and C1-C20 alkylene, hydroxyalkylene, aryl-substituted alkylene or hydroxyaryl-substituted alky­lene; and k is a number of 0 to 20.
• metal-deactivating agent examples include the following compounds:
• the metal-deactivating agent has a molecular weight larger than 2,000, its dispersibility in the resin is poor, so that the formation of silver streak cannot be effe­ctively suppressed.
• the metal-deactivating agent of the present inven­tion is used in an amount of 0.001 to 5.0 parts by weight, preferably 0.05 to 1.0 parts by weight per 100 parts of the thermoplastic resin.
• amount of the metal-deacti­vating agent is less than 0.001 parts by weight, the forma­tion of silver streak at high molding temperature is not prevented, and when it is more than 5.0 parts by weight, the final resin composition has decreased heat resistance and stiffness although the formation of silver streak is preven­ted.
• an organometallic colorant containing free metal in an amount of not more than 2,000 ppm is used as a colorant not to increase the amount of the free metal in the composition so large as the conventional colorant.
• organometallic colorant examples include (i) Phthalocyanine containing Co, (ii) Lothol Red con­taining Ba, Ca, Na, Sr, Mn or Fe, (iii) Lake Red containing Ba or Al, (iv) Brilliant Carmine (Pigment Scarlet) contai­ning Ba, Ni, Cu, Pb or Ca, (v) Alizarin Lake containing Ca, Ba, Al, Sr, Pb, Mg or Fe, (vi) Watchung Red (Permanent Red) containing Ca or Mn, (vii) Naphtol Green containing Ba or Fe, (viii) Acid Green Lake containing Ba, and mixtures thereof.
• Phthalocyanine type pigment containing copper which is thermally unstable and induces silver streaks is used according to the present invention.
• the colorant contains the free metal in an amount of not more than 1,000 ppm.
• the colorant contains more than 2,000 ppm of free metal, it is thermally treated in sulfuric acid to reduce the content of free metal to 2,000 ppm or less.
• the content of free metal is determined by extracting the free metal elements from the colorant with an inorganic acid such as sulfuric acid and measuring the amount of free metal contained in the acid by atomic-absorption spectroscopy or colorimetry.
• a ratio of the thermoplastic resin and the organo­metallic colorant is not limited, and the resin composition can be colored in any color with adequate chroma, hue and color value by a suitable organometallic colorant.
• a resin composition containing a larger amount of the organometallic colorant than required is prepared as a color concentrate and, in use, it is mixed with an uncolored thermoplastic resin to obtain a composition having desired color.
• the organometallic colorant is added in an amount of 0.01 to 20 parts by weight per 100 parts by weight of the thermoplastic resin.
• the colorant is added in an amount of 5 to 100 parts by weight per 100 parts by weight of the thermo­plastic resin.
• the amount of free metal introduced in the resin composition from the colorant is preferably not more than 100 ppm based on the total weight of the thermoplastic resin and the organometallic colorant.
• the thermo­plastic resin composition of the present invention comprises the thermoplastic resin and the organometallic colorant containing not more than 1,000 ppm of free metal, and the amount of free metal in the composition is not more than 50 ppm based on the total weight of the thermoplastic resin and the organometallic colorant.
• thermoplastic resin composition of the present invention may be prepared by any of conventional mixing or kneading methods, for example, by using a Banbury mixer, a single or twin screw extruder, and the like.
• thermoplastic resin composition of the present invention may contain any conventional additive which is added to the thermoplastic resin.
• additives are an in­organic colorant, an organic colorant, an inorganic filler, an antioxidant, a plasticizer, an antistatic agent, an ultraviolet light absorber, a flame retardant, a blowing agent, a lubricant and the like.
• Styrene-acrylonitrile copolymer "Sebian N-JD” manufactured by Daicel Chemical Industries, Ltd. (acrylo­nitrile content, 27 %; intrinsic viscosity, 0.62 in dimethylformaide at 30°C).
• Phthalocyanine Blue "Sumitone Cyanine Blue GH” manufactured by Sumitomo Chemical Company, Ltd, which con­tains 2,850 ppm of free metal.
• ⁇ -alkyl-substituted aromatic copolymer (a-1 to a-3), the ABS graft polymer, the AS copolymer, polycarbo­nate, the metal-deactivating agent (B-1 to B-12), the colo­rant and the antioxidant (1 to 3) were mixed by the Banbury mixer and then kneaded and pelletized by an extruder.
• Resin temperature 280°C (preset temp.: 270°C) 290°C (preset temp.: 280°C)
• Detention time 3 or 10 minutes
• Back pressure 5 kg/cm2
• Injection rate 8/10 Screw rotation rate: 100 rpm
• thermoplastic resin compo­sition The composition of each thermoplastic resin compo­sition and evaluation results of silver streaks are shown in Table 3.
• thermoplastic resin compositions one of which contained no metal-deacti­ vating agent and the other of which contained the metal-­deactivating agent according to the present invention were examined on heat deflection temperature (1 ⁇ 4", 264 psi, no annealing), processability (230°C, 60 kg/cm2) and notched Izod impact strength (1 ⁇ 4", 23°C). It was confirmed that there was no material difference between two compositions.
• Example 2 the ⁇ -alkyl-substituted aromatic copolymer (a-1 to a-3) was prepared in the same manner as in Example 1, and the ABS graft polymer was prepared in the same manner as in Example 1 but adding 0.5 part of 4,4 ⁇ -­butylidene-bis-(6-tert.-butyl-3-methylphenol) and 0.3 part of dilauryl 3,3 ⁇ -thiodipropionate to 100 parts of the poly­mer latex.
• the AS copolymer, polycarbonate and the anti­oxidant were the same as used in Example 1.
• the colorant As the colorant, the colorant prepared in Examples 2-8 or Comparative Examples 2-5 was used and no metal-deac­tivating agent was used.
• thermoplastic resin mixture 70 % of ⁇ -alkyl-substituted aromatic copolymer and 30 % of the ABS graft polymer
• organometallic colorant 1 part of the antioxidant (a, b or c) (in Com­position Nos. 13, 15, 16 and 17, the antioxidant was used.)
• the antioxidant a, b or c
• Example 2 After drying the pellets at 110°C for 4 hours, they were molded under the same conditions as in Example 1 to prepare four sample plates (from second to fifth shots) (each 90 mm x 40 mm x 3 mm). The formation of silver streaks was visually observed and evaluated according to the following criteria: O: No silver streak ⁇ : Silver streaks formed slightly X: Silver streaks formed XX: A large number of silver streaks formed
• a sample plate made from each of two colored thermoplastic resin compositions one of which contained the commercially available organometallic colorant containing more than 2,000 ppm of free metal and the other of which contained the organometallic colorant according to the present invention containing 2,000 ppm or less of free metal was examined on heat deflection temperature (1 ⁇ 4", 264 psi, no annealing), processability (230°C, 60 kg/cm2) and notched Izod impact strength (1 ⁇ 4", 23°C). It was confirmed that there was no material difference between two compositions.
• thermoplastic resin mixture 40 % of ⁇ -alkyl-substituted aromatic copolymer (a-1), 35 % of the ABS graft polymer and 25 %arts of the AS copolymer
• organometallic colorant and 1 part of the anti­oxidant were mixed by the Banbury mixer and kneaded and extruded by an extruder to produce colored pellets.
• the sample plates were produced in the same manner as above and evaluated with respect to the formation of silver streaks in the same way as above.
• the composition and the evaluation results are shown in Table 5.
• a sample plate made from each of two colored thermoplastic resin compositions one of which contained the commercially available organometallic colorant containing more than 2,000 ppm of free metal and the other of which contained the organometallic colorant according to the present invention containing 2,000 ppm or less of free metal was examined on heat deflection temperature (1 ⁇ 4", 264 psi, no annealing), processability (230°C, 60 kg/cm2) and notched Izod impact strength (1 ⁇ 4", 23°C). It was confirmed that there was no material difference between two compositions.
• thermoplastic resin mixture (20 % of ⁇ -alkyl-substituted aromatic copolymer (a-3), 30 % of the ABS graft polymer and 50 % of polycarbonate) and 1.5 or 6 parts of the organometallic colorant and 1 part of the anti­oxidant were mixed by the Banbury mixer and kneaded and extruded by an extruder to produce colored pellets.
• thermolyplastic resin compositions one of which contained the com­merically available organometallic colorant containing more than 2,000 ppm of free metal and the other of which contai­ned the organometallic colorant according to the present invention containing 2,000 ppm or less of free metal was examined on heat deflection temperature (1 ⁇ 4", 264 psi, no annealing), processability (230°C, 60 kg/cm2) and notched Izod impact strength (1 ⁇ 4", 23°C). It was confirmed that there was no material difference between two compositions.
• thermoplastic resin mixture 70 % of ⁇ -alkyl-substituted aromatic copolymer (a-3) and 30 % of the ABS graft polymer, 0.3 part of titanium oxide, 0.2 part of carbon black, 0.3 part of iron oxide red, 0.2 part of perylene red, 2.0 parts of the organometallic colorant (Com­parative Example 2 or Example 2 or 3), 0.5 part of ethylene­bisstearamide as a processing aid and 0.5 part of calcium stearate were mixed by the Banbury mixer and kneaded and extruded by an extruder to produce colored pellets.
• a sample plate made from each of two colored thermoplastic resin compositions one of which contained the commercially available organometallic colorant containing more than 2,000 ppm of free metal and the other of which contained the organometallic colorant according to the present invention containing 2,000 ppm or less of free metal was examined on heat deflection temperature (1 ⁇ 4", 264 psi, no annealing), processability (230°C, 60 kg/cm2) and notched Izod impact strength (1 ⁇ 4", 23°C). It was confirmed that there was no material difference between two compositions.

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• 1987
  • 1987-10-13 ES ES92107118T patent/ES2142309T3/es not_active Expired - Lifetime
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• 1992
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